Military dog handlers and their animals understandably have a unique bond.
Last year Treo, a retired explosives search dog, died.
His owner was understandably devastated, but came up with an innovative way of keeping his memory alive.
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An excerpt from Mr Heyhoe's book reads:
"This is the incredible true story of the unbreakable bond forged between Treo, the world's most highly decorated dog, and his handler Sgt. Dave Heyhoe, whilst doing the most dangerous job on earth.
"Dave, known to his fellow soldiers as 'the Dog Whisperer' and Treo were sent forwards, alone and unprotected, to detect the Taliban's murderous IEDs."